The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 29, 2006
Filed:
Jan. 31, 2005
Scott Robert Humphreys, Greensboro, NC (US);
Ryan Lee Bunch, Greensboro, NC (US);
Barry Travis Hunt, Jr., Greensboro, NC (US);
Alexander Wayne Hietala, Phoenix, AZ (US);
Scott Robert Humphreys, Greensboro, NC (US);
Ryan Lee Bunch, Greensboro, NC (US);
Barry Travis Hunt, Jr., Greensboro, NC (US);
Alexander Wayne Hietala, Phoenix, AZ (US);
RF Micro Devices, Inc., Greensboro, NC (US);
Abstract
A fractional-N offset phase locked loop (FN-OPLL) is provided. The FN-OPLL includes a fractional divider, a phase detector, a loop filter, a voltage controlled oscillator (VCO), and feedback circuitry. Combiner circuitry combines an initial fractional divide value and a modulation signal to provide a combined fractional divide value. Based on the combined fractional divide value, the fractional-N divider divides a reference frequency and provides a divided reference frequency to the phase detector. The phase detector compares a phase of the divided reference frequency to a phase of a feedback signal to provide a comparison signal. The comparison signal is filtered by the loop filter to provide a control signal to the VCO, where the control signal controls a frequency of an output signal of the VCO. The output signal is processed by the feedback circuitry to provide the feedback signal to the phase detector.